public static QExprGroup Combine(QExprGroup subGroup1, QExprGroup subGroup2, string groupOperator = Constants.QUERY_AND)
{
QExprGroup group;
if (groupOperator == Constants.QUERY_AND)
group = new AndExprGroup();
else
group = new OrExprGroup();
if (subGroup1 != null)
group.SubGroups.Add(subGroup1);
if (subGroup2 != null)
group.SubGroups.Add(subGroup2);
return group;
}
internal static QExprGroup CreateExprGroup(string groupOperator, CallInfo callInfo, object[] args)
{
if(callInfo != null
&& args != null
&& args.Length > 0
&& callInfo.ArgumentCount == args.Length)
{
int argsCount = args.Length;
int namedArgsCount = callInfo.ArgumentNames.Count;
QExpr[] qexprs = new QExpr[namedArgsCount];
QExprGroup[] qgroups = new QExprGroup[argsCount - namedArgsCount];
for (int i = 0; i < argsCount - namedArgsCount; i++)
{
QExprGroup qgroup = args[i] as QExprGroup;
if (qgroup == null)
throw new Exception("An unnamed Q parameter must be of type QPredicate");
qgroups[i] = qgroup;
}
for (int i = 0; i < namedArgsCount; i++)
{
string[] lhsAndOp = callInfo.ArgumentNames[i].Split(CUSTOM_QUERY_SYNTAX_SEP, StringSplitOptions.None);
if (lhsAndOp == null || lhsAndOp.Length == 0 || lhsAndOp.Length < 1)
throw new Exception("A Q parameter name must be composed of field name & operator name separated by '__' (double underscore)");
qexprs[i] = new QExpr(lhsAndOp[0],
lhsAndOp.Length >= 2 ? lhsAndOp[lhsAndOp.Length - 1] : Constants.QueryCompareOps.EXACT,
args[argsCount - namedArgsCount + i]);
}
QExprGroup exprGroup;
if (groupOperator == Constants.QUERY_AND)
exprGroup = new AndExprGroup();
else
exprGroup = new OrExprGroup();
if (qgroups != null)
exprGroup.SubGroups.AddRange(qgroups);
if (qexprs != null)
exprGroup.Expressions.AddRange(qexprs);
return exprGroup;
}
return null;
}
public Model Get(object pk = null)
{
if (pk != null)
{
QExprGroup qeg = new AndExprGroup().Add(
new QExpr(ModelInfo.ModelPKName, Constants.QueryCompareOps.EXACT, pk)
);
IEnumerable<Model> models = new Queryset(this).Filter(qeg).All();
if (models != null && models.Count() == 1)
return models.Single();
return null;
}
else
{
return OrmManager.CreateNewModel(ModelInfo.ModelApp, ModelInfo.ModelType);
}
}